Term ends Apr 22, 2033 · High confidence
20-year base term ends Apr 18, 2033
Held by Proterial, Ltd.
Filed Apr 18, 2013 as application 13/865,881 · Granted Apr 7, 2015
Base term plus 4 days of patent term adjustment (USPTO delay)
Today
2013
2033
Clock starts
Apr 18, 2013
Apr 18, 2013
Term ends
Apr 22, 2033
Apr 22, 2033
Granted
Apr 7, 2015
Apr 7, 2015
base term
fee events
Updated Nov 14, 2026 · includes USPTO assignment & status data published Nov 14, 2026 and grant & fee data published Nov 10, 2026 (weekly) · how we know
4
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
3 of 3
Maintenance fees paid
Three maintenance fees fall due, at 3.5, 7.5 and 11.5 years from grant. This counts the ones the record shows paid.
9
Family applications on record here
Applications sharing this one's continuity chain whose file history this site holds. The family may have others.
This patent's term runs 4 days past its 20-year base term on prosecution delay. All three maintenance fees are recorded paid; no more fees are due. Confidence: High. from the record
How we calculated this date
One row per rule, each showing its own input and what it did to the date. A step we could not verify says so instead of resolving itself.
| Step | Input | Date after this step | Confidence |
|---|---|---|---|
| Base term, 20 years from filing | Clock starts Apr 18, 2013, when this application, 13/865,881, was filed | Apr 18, 2033 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +4 days, USPTO patent term adjustment record | Apr 22, 2033 | High confidence |
| Terminal disclaimer cap | None on record | no cap applied | High confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 3 of 3 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Apr 22, 2033 | High confidence |
This family
| US 9,000,301 | this patent Apr 2033 | Apr 2033 |
| US 9,862,336 | In force Apr 2033 | Apr 2033 |
| US 9,463,756 | In force Apr 2033 | Apr 2033 |
| US 9,902,347 | In force Apr 2033 | Apr 2033 |
| US 10,279,756 | In force no later than Apr 2033 | no later than Apr 2033 |
| US 11,077,806 | In force no later than Apr 2033 | no later than Apr 2033 |
| US 11,987,188 | In force Apr 2033 | Apr 2033 |
| US 12,109,954 | In force Apr 2033 | Apr 2033 |
8 of 9 applications in this family shown, earliest filings first. The applications whose file history this site holds. The family may have others.
Assignments
Assignment documents as recorded at the USPTO, oldest first, with the reel and frame each was recorded at. A recorded assignment is a filed document, not a statement of current ownership, and the absence of a later one is not evidence that the last one still stands.
| Recorded | Assignor | Assignee | Conveyance |
|---|---|---|---|
| Apr 19, 2013 Reel 30332, frame 34 | Hayakawa, Yoshikazu; Eshima, Hirotaka | Hitachi Cable, Ltd. | Assignment of Assignor's Interest |
| Feb 15, 2014 Reel 32268, frame 297 | Hitachi Cable, Ltd. | Hitachi Metals, Ltd. | Merger |
| Aug 2, 2016 Reel 39549, frame 445 | Hitachi Metals, Ltd. | Hitachi Metals, Ltd. | Change of Name |
| Dec 27, 2023 Reel 66130, frame 563 | Hitachi Metals, Ltd. | Proterial, Ltd. | Change of Name |
Sources
Google Patents · The patent document at USPTO · Assignment records at USPTO
USPTO account required: This application in Patent Center · USPTO's maintenance fee lookup
Maintenance fee events come from USPTO's own fee records. Its fee lookup asks for the patent number and the application number.
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
What's changing
Apr 2033
Term ends Apr 22, 2033. No further fees fall due before then
Note
The 4 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
90
later US patents cite this one
That is top 5% of utility patents granted in 2015 in our data, the only group it is compared against.
How we rank
Every date shows its work: the base term, any term adjustment or extension, any disclaimer cap, and the maintenance fee record, each with a confidence tier. How this record was built
Computed patent terms end on the dates shown. Related patents and pending applications may cover overlapping subject matter.
In force means the term is running and no lapse is on record. It is not a finding that the patent is valid.